Saudi Arabia has ordered at least one BlackBerry smartphone service to be blocked as of next Friday, Reuters has reported. The Saudi telecom watchdog said telecom companies in the kingdom must block an unspecified Blackberry service as of Friday. Industry sources told the news service on Sunday that the intention was to ban Blackberry Messenger. The ban is to last until the kingdom's three mobile phone operators "fulfil the regulatory requirements it has requested," the regulator said in a statement.